Wal as seen from orbit.
Moon of Urlum
Orbital Characteristics
Semi-major axis 67 553 668 m [Note 1]
Apoapsis 69 107 402 m [Note 1]
Periapsis 65 999 934 m [Note 1]
Orbital eccentricity 0.02
Orbital inclination 1.9 °
Argument of periapsis 0 °
Longitude of the ascending node 40 °
Mean anomaly 2.9615 rad (at 0s UT)
Sidereal orbital period 1 009 232 s
46 d 4 h 20 m 32.4 s
Synodic orbital period 1010602.8 s
Orbital Velocity 411 to 430 m/s
Longest Time Eclipsed 10596 s
Physical Characteristics
Equatorial radius 370 000 m
Equatorial Circumference 2 324 779 m
Surface area 1.7203361×1012 m2
Mass 7.4453990×1021 kg
Standard gravitational parameter 4.9691189×1011 m3/s2
Density 35 090.875 kg/m3
Surface gravity 3.63 m/s2 (0.37 g)
Escape velocity 1 638.91 m/s
Sidereal rotation period 1 009 238.4 s
46 d 4 h 20 m 38.4 s
Sidereal rotational velocity 2.3035 m/s
Synchronous orbit 23 034.66 km
Sphere of influence 18 933 505 m[Note 1]
Atmospheric Characteristics
Atmosphere present × No
Scientific multiplier
Surface 13
Near space 12
Outer space 11.5

  1. 1.0 1.1 1.2 1.3 The distances are given from the bodies center not surface (unlike ingame)

Wal is a moon of Urlum. It has a moon itself, Tal. It is the biggest and most distant of the Urlumian moons, with slightly more than Duna's gravity. Its large number of biomes and sub-moon make it a particularly attractive member of the system to visit.

In-Game Description

Wal is instantly recognizable due to its walnut-like shape. Its multi-colored surface has led to it winning the title 'Most Beautiful Moon of the Year' two years in a row. Its distinctive equatorial ridge is likely to be caused by the tidal forces created by Wal's moon Tal.

Kerbal Astronomical Society

Physical Properties

Wal has a very striking appearance - a mish-mash of rocky material and golden-colored material with a large equatorial bulge or mountain range. This gives it a distinctive walnut shape, hence its name.

The density of the moon can indicate the following structure: an iron-nickel core that heats the interior, with a radius of 55.5 km; a rocky mantle, 296 km thick; and a rocky crust 18.5 km thick.

The surface of the moon is chemically complex, and is possibly made of several layers and types of rock. Surface layers may be exposed due to crater impacts, or the moon may be a combination of two large bodies that collided with each other. The latter theory is preferred, as it can correlate to the formation of Wal's moon, Tal.

The golden color of the surface may indicate that Tal came from Wal, ejected by impact.


Wal has a moon itself, Tal, which orbits Wal while they both orbit Urlum. This is the only instance of a sub-satellite in the game.


Wal has a total of 16 biomes. As of OPM v2.1, biomes on Wal are currently broken.

Biome list

Wal Biome Map

Wal biome map

  • Chronister Valley
  • Misucat Valley
  • Draylax Plains
  • Soukara Plains
  • Levinius Plains
  • Kessik Region
  • Moach Region
  • Diomedea Region
  • Dozaria Region
  • Volchok Region
  • Eminiar Region
  • Andor Crater
  • Manark Crater Chain
  • Boreth Mountains
  • Gault Mountains
  • Pandro Mountains

Reference Frames

Warp Minimum Altitude
5× 6 938 m
10× 13 875 m
50× 27 750 m
100× 55 500 m
1 000× 111 000 m
10 000× 222 000 m
100 000× 444 000 m

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